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A headstander is any of several species of South American fish, including Anostomus ternetzi, Anostomus anostomus (family Anostomidae) and members of genus Chilodus from the family Chilodontidae. The name derives from their habit of swimming at a 45° angle, head pointed downwards. The fish could "stand up" with its head while swimming.
The Headstander is a fairly large fish. They are predominately found in shallow streams with strong currents and a lot of algae, which they feed off of. They come from South America and prefere slightly acidic water with medium hardness. The Headstander will eat almost any kind of food, but mostly enjoy hair algae. Headstanders have also been called Ternetz's Anostomus. The Headstander will reach up to approximately 4 3/4 inches in length and is very active. They are very sensitive to shadows, like to jump, and tend to be slightly aggressive. They are most peaceful when kept in pairs or small groups, no more than 6.
- "Tropical Fish : Odd Ball & Miscellaneous : Spotted Headstander - Tropical Fish By Post.co.uk". Tropical Fish by Post. Retrieved 12 April 2013.
- "Headstander, Anostomus ternetzi, Red Mouth Headstander Fish Guide". Animal-World. Retrieved 12 April 2013.
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